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| Titel |
Local inundation distances and regional tsunami recurrence in the Indian Ocean inferred from luminescence dating of sandy deposits in Thailand |
| VerfasserIn |
D. Brill, N. Klasen, K. Jankaew, H. Brückner, D. Kelletat, A. Scheffers, S. Scheffers |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 12, no. 7 ; Nr. 12, no. 7 (2012-07-12), S.2177-2192 |
| Datensatznummer |
250010984
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| Publikation (Nr.) |
 copernicus.org/nhess-12-2177-2012.pdf |
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| Zusammenfassung |
| The Holocene beach-ridge plain of Phra Thong Island (Ko Phra Thong, SW
Thailand) provides sedimentary evidence of several palaeotsunamis, in
addition to the deposit of the 2004 Indian Ocean tsunami. Due to poor preservation
conditions, these palaeoevent layers are restricted to swales. Correlation across beach ridges,
which is important e.g. to reconstruct inundation distances, remains a major challenge. A primary tool
for establishing a precisely confined correlation of the sand sheets is the
use of chronological data. Since the application of radiocarbon dating is
limited by the scarcity of appropriate material, this study utilised optically
stimulated luminescence (OSL) dating of tsunamigenic quartz grains.
Generally, the sediments showed favourable luminescence properties regarding
signal intensity, dose recovery and thermal stability. Disturbances of the
OSL signal due to partial bleaching were corrected using the minimum age
model. At least three palaeoevents – being 490–550, 925–1035 and 1740–2000 yr old – were distinguished by dating the discontinuous sand sheets at
four different sites. Besides this chronological framework, the OSL data
provide the opportunity to correlate the discontinuous sand sheets between
spatially separated sites within the same swale as well as across ridges.
This allows for first estimates of inundation distances for the
palaeotsunamis documented on Phra Thong Island. Furthermore, the two younger
events overlap in age with contemporaneous tsunami and earthquake evidence from
other coasts bordering the Indian Ocean. |
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